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Javascript
Dev
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Why JavaScript? Actually it's ECMAScript
- JavaScript and ECMAScript are two terms often used interchangeably, but it's important to note that ECMAScript is the official standard for the language.
- JavaScript was created by Brendan Eich in 1995 to bring interactivity to HTML in Netscape, which was later copied by Microsoft as JScript.
- The browser wars led to ECMAScript being established as the standard, with JavaScript and JScript becoming dialects of it.
- JavaScript's popularity grew due to its cross-platform compatibility and ease of use, leading to its widespread adoption, and later expansions like Node.js and Deno.
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Medium
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199
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Canceling Fetch Requests in JavaScript with AbortController
- The AbortController in JavaScript allows for canceling fetch requests by creating an AbortController with a signal passed into the fetch call.
- The signal object, built on top of EventTarget, holds its state internally and dispatches an 'abort' event when controller.abort() is called.
- Using AbortController and signal, you can cancel fetch requests effectively, with the fetch promise getting rejected on abort and a 'AbortError' DOMException thrown.
- Creating new controllers for retry logic ensures a clean state for each request and simplifies cancel behavior in your code.
- Implementing canceling on demand allows for efficiently managing fetch requests, preventing wasted network activity and displaying stale data.
- In frontend frameworks like React or Vue, canceling fetches on unmount helps prevent errors and ensures UI consistency.
- Using setTimeout with AbortController provides a way to set timeouts for fetch requests and handle fallback behaviors.
- AbortController can be used beyond fetch, enabling the cancelation of timers, loops, and other long-running logic by checking the signal.
- By utilizing AbortController and signals, you can make asynchronous processes more responsive to changes in your application, improving overall user experience.
- The mechanics of AbortController revolve around creating controllers with signals to stop processes immediately, making it a simple and effective tool for managing asynchronous operations.
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Dev
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22
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Build a Simple Direct Messaging (DM) App Using JavaScript
- Article: Build a Simple Direct Messaging (DM) App Using JavaScript
- Description: This article guides beginners through building a basic DM interface using HTML, CSS, and JavaScript to practice essential web development skills.
- Features: Users can send messages, messages are displayed in the chat window, optional message storage using localStorage, clean UI.
- Possible Improvements: Add timestamps to messages, introduce multiple users, enhance mobile responsiveness, integrate with backend for real-time messaging.
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Dev
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386
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The Subtle Trap of ISO Date Strings in JavaScript
- When dealing with dates and times in applications, handling different time zones can lead to unexpected challenges.
- JavaScript's parsing of ISO date strings can behave unexpectedly, causing inconsistencies when using new Date(str) and parseISO(str) functions.
- Full ISO datetime strings with a 'Z' at the end are parsed as UTC and converted to local time, while datetime strings without 'Z' are interpreted as local time by both functions.
- Date-only strings without a time component can lead to different results where parseISO(str) treats them as local time, while new Date(str) interprets them as midnight UTC, potentially causing discrepancies.
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Dev
4w
306
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JavaScript-less Mobile Menu with Tailwind
- The article explores creating a mobile navigation menu using the checkbox hack without JavaScript, focusing on CSS and Tailwind.
- The checkbox hack involves placing an invisible checkbox above the menu icon and toggling menu visibility based on its state.
- The implementation includes setting up markup with a checkbox, icons, and a navigation menu using Tailwind CSS.
- Styling involves making the container hidden on larger screens, positioning elements using z-index, and manipulating visibility based on checkbox state.
- Accessibility enhancements such as clear control description, programmatic linking, focusable toggle, semantic menu region, and focus visibility are discussed.
- Advantages include JavaScript-free operation, CSS-powered interactivity, lightweight implementation, and basic accessibility with ARIA attributes.
- Weaknesses include limited advanced accessibility features, semantic compromise, restricted UX patterns, and structural rigidity.
- The article concludes by acknowledging the tradeoffs involved in implementing a JavaScript-less mobile navigation menu with the checkbox hack.
- Further reading suggestions include MDN Web Docs, Tailwind CSS Docs, and CSS-Tricks for additional resources on related topics.
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Dev
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280
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Understanding and Mitigating JavaScript Memory Bloat
- Memory management in JavaScript is crucial for performance and user experience, especially in complex applications with large datasets.
- JavaScript memory bloat refers to inefficient memory usage leading to performance degradation in web applications.
- JavaScript's evolution with ECMAScript standards introduced complexities in memory management due to the rise of SPAs and frameworks.
- Garbage collection mechanisms like Mark-and-Sweep and Reference Counting are crucial for reclaiming memory in JavaScript.
- Identification of memory bloat involves understanding closures, event listeners, and management of large objects.
- Memory profiling tools like Chrome DevTools are essential for analyzing memory usage and identifying retained objects.
- Mitigation strategies include limiting scope, managing event listeners, and utilizing object pooling for optimized memory usage.
- Advanced techniques like using immutable data structures and debouncing or throttling events can further optimize memory management.
- Real-world applications like Chromebook OS and Netflix utilize intricate memory management techniques to optimize performance.
- Common pitfalls in memory management include failing to dispose event listeners and retaining reference cycles.
- Developers should prioritize memory management alongside other concerns to ensure efficient and scalable web applications.
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Medium
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289
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Let’s dive into three super useful JavaScript functions: map(), filter(), and reduce().
- map() transforms each element of an array by applying a function and returns a new array with the transformed values.
- filter() selects elements from an array based on a condition provided by a test function and returns a new array containing only the passing elements.
- reduce() blends all elements of an array into a single output using a reducer function that combines each element with an accumulator.
- map(), filter(), and reduce() are powerful higher-order functions in JavaScript that simplify array manipulation and make code cleaner and more readable.
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Dev
4w
355
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Daily JavaScript Challenge #JS-189: Group Anagrams
- Today's JavaScript coding challenge is about grouping anagrams
- Objective: Write a function to group anagrams within an array of strings
- An anagram is a word formed by rearranging the letters of another word
- Challenge participants need to create and test their solutions, sharing their approaches in the comments section
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Dev
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570
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Top 10 Underrated JavaScript Libraries You Should Explore in 2025
- JavaScript is evolving rapidly with new smaller, smarter libraries emerging alongside giants like React and Vue.
- 10 underrated JavaScript libraries for 2025 include Alpine.js for Vue-like reactivity, SolidJS for faster React-like reactivity, and HTMX for modern interfaces using HTML.
- Other libraries like tRPC for type-safe APIs, Shoelace for customizable UI components, and Qwik for resumable apps with partial hydration are also highlighted.
- The list also includes Zustand for state management, Valibot for validation, Radix UI for building design systems, and Chart.xkcd for humor-infused data visualizations.
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Medium
4w
80
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Creating an Arm32 emulator in JavaScript part 3
- An Arm32 emulator is being created in JavaScript, with the ability to easily add and remove devices to the CPU for reading and writing to addresses.
- A MemoryController interface is being developed to map devices to memory regions, allowing attachment and detachment of devices, as well as read and write operations for 8 and 32 bit unsigned integers.
- Implementing the MemoryController involves functions for mapping and unmapping devices, reading and writing unsigned integers, and retrieving devices based on addresses.
- The CPU is updated to integrate the MemoryController, providing an abstraction layer for connecting various devices using the address space, enabling communication with different devices from programs.
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Medium
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307
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Optional Chaining in JavaScript Works Differently Than You Think
- Optional chaining in JavaScript allows you to safely navigate through an object's structure without causing errors if a value is missing.
- The ?. operator checks for null or undefined and returns undefined instead of throwing an error.
- Only null and undefined will short-circuit the optional chaining, not other falsy values like 0 or false.
- Optional chaining works for nested objects, stopping the chain if any part is null or undefined.
- You can use optional chaining not just for property access but also to safely call methods or functions that may not exist.
- It is important to note that optional chaining does not convert null or undefined to empty objects but simply stops the chain.
- Nullish coalescing (??) complements optional chaining by only falling back on null or undefined values.
- Combining nullish coalescing with optional chaining provides a safer way to access data with backup values.
- Using ?? and || together in an expression requires parentheses to define evaluation order.
- Optional chaining and nullish coalescing change how JavaScript processes data access, avoiding unexpected behavior and errors.
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Dev
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329
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Understanding Promises in JavaScript: A Formal Introduction
- Asynchronous programming is crucial in web development, and JavaScript's single-threaded nature relies on Promises for managing non-blocking operations.
- Promises act as proxies for values that may resolve in the future, enhancing code readability and reducing callback hell.
- Promises have three states: Pending, Fulfilled, and Rejected, and once settled, they become immutable.
- Consuming Promises involves using .then() for resolution, .catch() for errors, and .finally() for executing code regardless of outcome. Promise chaining and error handling are key features.
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Medium
4w
213
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Import Maps and Built In Modules in JavaScript Runtimes
- Import maps provide instructions to JavaScript runtimes on how to load modules, offering a more direct and explicit approach compared to Node's resolution process.
- By defining mappings in an import map inside HTML, browsers can understand and rewrite bare specifiers to valid URLs before initiating fetch requests.
- Import maps allow mapping multiple names and support scoped overrides to manage module versions in different parts of the codebase.
- They do not mix well with dynamic import() unless all specifiers are covered by the map, and caching may require query params for file changes.
- Built-in modules in JavaScript runtimes like Node and Deno eliminate the need for bundlers and loaders, with Deno using stable URLs for imports and managing caching internally.
- Node's built-in modules like fs, path, and http are part of the core runtime, while Deno offers a minimal runtime with modules loaded from stable URLs.
- Deno's strict module loading behavior requires explicit imports for both local files and remote resources, improving predictability across projects.
- Deno caches modules based on their full URLs, ensuring that even small changes trigger separate cache entries and enabling easy updates by changing the URL.
- Importing modules in Deno directly points to the source, eliminating the need for dependency managers or node_modules folders and providing a self-contained project.
- Projects in Deno are explicit, direct, and organized without hidden dependency graphs, offering bundling and compilation features for packaging projects without additional dependencies.
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Dev
4w
93
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Shocking Things You Can Do in JavaScript
- JavaScript has evolved with powerful capabilities that eliminate the need for popular libraries, such as set operations that replace lodash, non-destructive array methods, and object grouping.
- New features like logical assignment operators, top-level await for async module initialization, and private class features enhance code conciseness and encapsulation.
- Text segmentation with Intl.Segmenter improves handling of languages without spaces between words, while Atomics and SharedArrayBuffer enable true parallelism in JavaScript.
- These features signify the continuous evolution of JavaScript, offering developers cleaner, more maintainable code and reducing reliance on external dependencies.
- By leveraging these native solutions, developers can optimize performance and discover the hidden capabilities of modern JavaScript.
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Javarevisited
4w
356
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Top 5 Udemy Courses to learn D3.js for Data Visualization with JavaScript in 2025 - Best of Lot
- D3.js is a popular JavaScript library for creating interactive data visualizations on the web, commonly used by Data Scientists and Analysts.
- Several courses are available in 2025 to learn D3.js, teaching how to create interactive visualizations and charts by binding data to web elements.
- These courses cover basics of data visualization with D3, including building various types of charts like Bar charts, Pie charts, and Mind maps.
- Learning D3.js can be valuable for professionals needing to present data insights effectively to stakeholders and business audiences.
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